However, AVR devices are particularly prone to bricking when users start to play with the fuses (specific chip options), which is why it is highly recommended that you have multiple AVR devices on hand. Also, the AVR core has over 130 instructions, many of which are single-cycle (thanks to the one level pipeline), and there is no banking scheme. However, despite being a RISC CPU, the AVR core is arguably very powerful and has many advantages over competitor devices (such as the Microchip PIC range).įor example, the AVR core contains generic 8-bit registers that can be paired to create 16-bit pointers for memory locations. Some newer processor header files only have the new name, while some header files for older AVR processors only have the old names.Īny descriptive comment use used for all entries immediatly following it up to the first empty line.At the heart of most ATmega devices is the AVR CPU, which is described as a RISC-type CPU. This example has both the old and the new style interrupt names. The file is included in the parsing processĪll three entries will have the same description as given in the comment above it.Īll registers whose name start with PIN?, PORT? or DDR? are assigned as ports. The required processor specific from step 1 are parsed for the following patterns:.The PROCESSORNAME is added to the list of known processors and the include file is read and parsed. The file is read and for all lines looking like this:.If in doubt, use the source link to open the source header file and check the source yourself. This means that any conditional code in the header files is ignored which might cause some inaccuracies. As the viewer needs the source file comments, it does not use the gcc preprocessor. The viewer parses the header files to extract as much information as possible. But on the plus side, the information they provide is (almost) exactly the same as the compiler sees. The header files are not a perfect, not even a good souce for information, as only some processor specific header files contain descriptive comments. These header files are part of the AVR libc package. The AVR Device Explorer View can use the header file and its associated, processor specific header files as a data source. AVR Device Explorer View Data Source AVR Device Explorer View Data Source
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December 2022
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